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The   development   of   software   defined   FMCW   ionosonde   based   on   the  GNU  Radio

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The   development   of   software   defined   FMCW   ionosonde   based   on   the  GNU  Radio  

Hiromitsu  Ishibashi,  Takumi  Kondo,  and  Takuya  Tsugawa  

National  Institute  of  Information  and  Communications  Technology  ,  4-­‐2-­‐1  Nukui-­‐kita,   Koganei  184-­‐8795  JAPAN  

 

 We   are   developing   a   GNU   Radio   based   software   defined   FMCW   ionosonde   system.   The   initial  result  has  been  already  presented  at  the  SGEPSS  2016  fall  meeting:  as  for  the  receiving   system,   we   successfully   got   ionograms   using   the   transmitting   system   of   current   FMCW   ionosonde  in  Kokubuji  and  the  Ettus  Research  USRP  N210.  One  of  the  main  purposes  of  this   work   is   to   inherit   peripheral   units   of   current   FMCW   ionosonde   system,   which   is   currently   operated   in   the   Southeast   Asia   low-­‐latitude   ionospheric   network   (SEALION).   So,   we   have   adopted  X300  USRP  instead  of  N210  and  updated  programs  which  is  suitable  for  X300.  The   additional   frontend   unit   necessary   to   inherit   peripheral   units   of   current   FMCW   ionosonde   system  is  being  manufactured  now.  This  presentation  is  a  subsequent  follow-­‐up  report  for   these  past  6  months.  

 

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